winform messagebox.show自动关闭

悬赏园豆：10 [已关闭问题] 关闭于 2012-09-13 13:38

无法找到 PInvoke DLL “User32.dll” 这是什么原因。我要怎样才能获得user32.dll

.NET技术 C# Windows Forms

问题补充：

[DllImport("User32", CharSet = CharSet.Auto)]
private extern static IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("User32", CharSet = CharSet.Auto)]
public static extern int PostMessage(IntPtr hwd, int msg, IntPtr wparam, IntPtr lParma);// 这是user32外部导入
public const int WM_CLOSE = 0x10;

private void btnShow_Click(object sender, EventArgs e)
{
System.Windows.Forms.Timer setTimer = new System.Windows.Forms.Timer();
setTimer.Interval = (2000);
setTimer.Tick += new EventHandler(setTimer_Tick);
setTimer.Enabled = true;
setTimer.Start();

MessageBox.Show("2秒后关闭", "自动关闭");
}

void setTimer_Tick(object sender, EventArgs e)
{
KillMessageBox();
((System.Windows.Forms.Timer)sender).Stop();
}
void KillMessageBox()
{
IntPtr ptr = FindWindow(null, "自动关闭");//执行到这里无法找到user32
if (ptr != IntPtr.Zero)

PostMessage(ptr, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

}

是在windows ce 系统下